<template>
  <!-- 导航栏 -->
  <div class="home-container">
    <van-nav-bar sticky class="page-nav-bar" fixed>
      <van-button
        class="search-btn"
        slot="title"
        type="info"
        size="small"
        icon="search"
        to="/search"
        round
        >搜索</van-button
      >
    </van-nav-bar>
    <!-- 频道列表 -->
    <van-tabs class="channel-tabs" v-model="active" swipeable animated>
      <van-tab
        :title="channel.name"
        v-for="channel in channels"
        :key="channel.id"
      >
        <!-- 文章列表 -->
        <article-list ref="article-list" :channel="channel" />
      </van-tab>

      <!-- 汉堡按钮 -->
      <div slot="nav-right" class="placeholder"></div>
      <div
        class="hamburger-btn"
        slot="nav-right"
        @click="isChannelEditShow = true"
      >
        <i class="toutiao toutiao-gengduo"></i>
      </div>
    </van-tabs>

    <!-- 频道编辑弹出层 -->
    <van-popup
      class="popup"
      v-model="isChannelEditShow"
      closeable
      close-icon-position="top-left"
      position="bottom"
      :style="{ height: '100%' }"
    >
      <channel-edit
        :my-channels="channels"
        :activeIndex="active"
        @update-active="onUpdateActive"
      />
    </van-popup>
  </div>
</template>

<script>
import ChannelEdit from '../../../components/channel-edit.vue'
import { getUserChannels } from '../../../api/user'
import ArticleList from '../components/article-list.vue'
import { mapState } from 'vuex'
import { getItem } from '@/utils/storage.js'
export default {
  data () {
    return {
      active: 0,
      channels: [], // 频道列表
      isChannelEditShow: false // 控制编辑频道弹出层的显示状态
    }
  },
  components: {
    ArticleList,
    ChannelEdit
  },
  name: 'HomePage',
  created () {
    this.loadChannels()
  },
  methods: {
    async loadChannels () {
      // try {
      //   const { data } = await getUserChannels()
      //   this.channels = data.data.channels
      // } catch (err) {
      //   this.$toast('获取频道数据失败')
      // }
      let channels = []
      if (this.user) {
        // 已登录，请求获取用户频道列表
        const { data } = await getUserChannels()
        channels = data.data.channels
      } else {
        // 未登录，判断是否有本地的频道列表数据
        const localChannels = getItem('TOUTIAO_CHSNNELS')
        // 如果存在本地的频道列表数据
        if (localChannels) {
          channels = localChannels
        } else {
          // 没有，请求获取默认频道列表
          const { data } = await getUserChannels()
          channels = data.data.channels
        }
      }
      this.channels = channels
    },
    // 接收子·组件传递数据，实现频道切换
    onUpdateActive (index, isChannelEditShow = true) {
      // 更新激活状态
      this.active = index
      // 关闭弹层
      this.isChannelEditShow = isChannelEditShow
    }
  },
  computed: {
    ...mapState(['user'])
  }
}
// console.log(this.active)
</script>

<style lang="less" scoped>
.home-container {
  padding-top: 174px;
  padding-bottom: 100px;
  //   /deep/ .page-nav-bar{
  //     max-width:unset;
  //   }
  /deep/ .van-nav-bar__title {
    max-width: unset;
  }
  .search-btn {
    width: 551px;
    height: 66px;
    background-color: #5babfb;
    font-size: 28px;
  }
  .van-icon {
    font-size: 32px;
  }
  /deep/ .channel-tabs {
    .van-tabs__wrap {
      position: fixed;
      top: 92px;
      z-index: 1;
      left: 0;
      right: 0;
      height: 82px;
      .van-tab {
        min-width: 200px;

        border-right: 1px solid #edeff3;
        font-size: 30px;
        color: #777777;
      }
      .van-tab--active {
        color: #333333;
      }
      .van-tabs__nav {
        padding-bottom: 0px;
      }
      .van-tabs__line {
        bottom: 8px;
        width: 31px !important;
        height: 6px;
        background-color: #3296fa;
      }
    }
    .placeholder {
      flex-shrink: 0;
      width: 66px;
      height: 82px;
    }
    .hamburger-btn {
      position: fixed;
      right: 0;
      display: flex;
      justify-content: center;
      align-items: center;
      width: 66px;
      height: 82px;
      background-color: #fff;
      opacity: 0.902;
      i.toutiao {
        font-size: 33px;
      }
      &:before {
        content: '';
        position: absolute;
        left: 0;
        width: 1px;
        height: 100%;
        background-image: url(~@/assets/gradient-gray-line.png);
        background-size: contain;
      }
    }
  }
  .popup {
    position: fixed;
    top: 0px;
    z-index: 1;
    left: 0;
    right: 0;
    height: 82px;
  }
}
</style>
